The USB keyboard (Nektar Impact GX61) shows up as a MIDI input option in the Settings/ AUDIO/MIDI.
But it does not light the green MIDI IN light when I play notes and does not register notes in the MIDI record mode.
I make sure the keyboard is ON and ready when I start MM. It works on other applications.
Music Maker Premium 2019 - Intel i5 PC with Windows 10, EVGA GeForce GTX 1060 6gB graphics and a Behringer U-phoria UMC404HD USB interface.